MUMBAI, India, Aug. 10 -- Intellectual Property India has published a patent application (202611073898 A) filed by Indian Institute Of Technology Delhi on June 15, 2026, for A Sustainable Chromium-Free Two-Step Tannic Acid-Based Conversion Treatment For Corrosion Protection Of Rusted Iron Articles.
Inventors include Gosvami, Nitya Nand; Darda, Abu; Neelakantan, Suresh; Jain, Jayant; and Ramasubramanian, Lakshmi Narayan.
The application for the patent was published on July 31, 2026, under issue no. 31/2026.
Abstract: The present invention discloses a sustainable, chromium-free method for corrosion protection of iron substrates using a tannic acid–based two-step conversion treatment. The method involves mild acidic surface activation followed by aqueous tannic acid application to convert residual rust into a stable iron-tannate protective layer. The resulting conversion coating exhibits enhanced electrochemical corrosion resistance, aqueous stability, and compatibility with eco-friendly topcoats, making the process suitable for industrial, rural, and artisanal corrosion protection applications.
Disclaimer: Curated by HT Syndication.
